Pipe-threading hand-lathe.



J. P. BOND. PIPE THREADING HAND LATHE.

' APPLICATION FILED MAR. 16. 1903. I0 JQDEL. v

PATENTED'JULY 5,- 1904.

Patented July 5, 1904.

Fries.-

JHN P. BOND, OF WllNONA LAKE, lNDlANA, ASSlGNOR OF ONE-HALF TO CUBA GURDON BUUKllNUrHAM, OF OUEANPARK, CALIFORNIA.

lenre rrmenome HAND-LATHE.

SPEGIFICATION formingpart of Letters Patent No. 764,341, dated July 5, 1904:.

Application filed March 16, 1903. Serial No. 147,950. (No model.)

1T0 all whom itfinmyoonocra' Be it known that 1, Joan P. Born), a citizen of the United States, residing at Winona Lake, Kosciusko county, and State of llndiana, have invented a certain new and useful Pipe- Threading Hand-Lathe, of which the following is a specification.

llhe object of my invention is to provide a volve a large outlay on account of the great number of screw-dies required for ,diflcrent .sizes of pipe-and the expensiveness of such dies.

My inventionprovidesfor threading a pipe by the action of a simple cutting-point, as distinguished from a screw-die, the cutting-point heing guided-in a helical path by suitable means.

The invention comprises centering means adapted to engage withinthe pipe and to fur nish support which is substantially central 'With regard to the pipe-cutting means rotata bly mounted on such support, and a screw-v guide, whereby the cutting means is directed or forced in a helical path as it is turned to cut a thread on theoutside of. the pipe.

' Broadly considered, the invention consists in a pipe-threading device comprising a rotatable screw --t hread ed spindle or mandrel, a thrust-shoulder and a fulcrum portion on the spindle, armsresting on said fulcrum portion, a. member screwed on-said-spindle for moving the arms over'the fulcrum portion toward the thrust-shoulder, a cutter, a'nd'a cutter-carrier screwing on the spindle. Desirably the thrustsh oulder comprises a taper block mounted on the spindle and held against longitudinal movement thereon in one direction by an en largement of the spindle. The fulcrum portion is also desirably a separate piece mount.

ed on the spindle and held against longitudipipe.

nal movement thereon. Any suitable means may be provided for turning the spindle for- 5 moving the arms over the fulcrum portion toward the thrust-shoulder.

The accompanying drawings illustrate the invention.

Figure l is an elevation of the thread-cutting device in placeon a pipe, parts being in longitudinal section. Figs. II, Ill, and IV are detail views of disks or Washers acting as centering devices Fig. Yis an edge view of one of the centering wedges used in connec- 6o tion with the washers shown in Figs. II and Ill. Fig. V1 is an inner end view, of the device in position in the pipe.

. 1 designates a central spindle, that serves as the support or mandrel for the cutting- 5 head and is provided with centering means, whereby it is held centrally in the end of the Such centering means comprise col lars, disks, or plates 3 4t 5. Disk 3 (see Fig.

H) has a central tapped hole 16, whereby it 7 screws on the screw-threaded reduced inner end 2 of spindle 1. Disk 4 is centrally perforated at 6 to fit loosely on such reduced end and bear against a shoulder 7 of the spindle.

.Disk 5, Fig. IV, has a central bore 8 to pass over'the central larger portion of spindle 1 and bear against a shoulder 9 thereon. Said bore 8 and shoulder 9 are preferably conical, atleast in part, so as to cause the disk 8 to center exactly. on the spindle when it is brought up tight against the shoulder. Outwardly from this shoulder 9 the spindle 1 is provided with a screw-threaded portion 10, and beyond that with an extension 11, that serves as a handle in centering the spindle, 5

this part having a wrench-hold 12 formed I thereon. r

Wedges 13fit in seats desirably formed, as

radial slots 14 15, in the'disks or collars 3 t and are inclined on their inner sides, so that 9 when the disks 3 4c are drawn together said Wedges are forced outwardly by the seats 15 a a in disk 4 riding on such inclined faces. Said wedges are provided with transverse grooves 17 on one or both sides to engage with the .95."

edge of slots 14: in the disk 3 and prevent rcla tive longitudinal movement of said wedges on disk 3. This engagement of the'wedges 13 and disk 3 by grooves 17 and slotslat enables the wedges to be withdrawn when desired for the purpose of substituting wedges of different size. This engagement is also such as to prevent lateral wabbling or canting of the wedges when the parts are turned. Disk 4 is retained in place by a removable pin 18. Disks 3 4 and wedges 13 form, in connection with the screw-spindle portion 2, an expanding chuck to grip within the pipe and support and center the inner end of the spindle, while the disk 5 serves to support the outer. end and constitutes, in connection with the shoulder 9, means limiting the insertion of the spindle into the pipe. Said disk 5 is ooned or tapered to enable it to'fit the interior of'jthe pipe closely and allow for slight variations in the size of the pipe. Larger variations, as would occur in changing from,

. ularities in the'latter, it is desirable to cut away portions of the conical periphery thereof,

certain lines of contact.

' isadapted to be rotated on the spindle 1 and so as to leave a plurality of flaring surfaces 19, say'three, which touch the pipe-only along The cutter-head 20 engages by its tapped perforation 21 on the screw portion 10. of the spindle 1 and is provided with one or more handles 22, a steady-' ing or outer bearing 23, turning on'the extension 11 of the spindle, and with the cutterholder bracket or arm.24':. On said arm 24 are provided adjustable clamping devices for the toolfor example,=a set-screw 25 for adjusting the cutter longitudinally in its seat ,or

socket 26-and a set-screw-27, bearing against the side of the cutter to hold it in place. 28 indicates the cutter or chisel.

In using the device the proper disk 5 having been putin place on the spindle'and the disks 3 ialso put on the wedges 13 are slipped into said disks34. Disk '3 must be screwed out far enough to allow thegwedges to ass.

into the pipe, but to touch the inside thereof,

and the spindle is then inserted; into the pipe to bring the cone-disk 5 into engagement in the end of the pipe. Then by turning the spindle'the chuck on the inner end thereof is expandedrotation of the wedges being prevented by their frictional engagement with the inside of the pipe.

This tightening action of the chuck in the pipe-is completed by application of a wrench to the outer end of the spindle, and the spindle is thereby brought into substantially central or concentric relation with respectto the pipe.

Owing tothe'provision of a plurality of .means for centralizing the support 1 at'dif- 7o ferent places longitudinally of the pipe..- namely, the collar 5 .for centralizing at the outer end and the expanding chuck for centralizing at the inner end said support is also alined with respect to, the axis of the pipe.

The rotary head is then put on the spindle and screwed down on the screw portion 10 thereof and as the cutter or chisel. 28 passes onto theoutside of.the pipe it cuts a groove which, on account of theguiding action of the screw portion 10 of the spindle, is a screwthread of definite pitch. If the first cut thus made is not of'suflicient depth, the cutter may be adjusted in further and additional cuts 7 made until the desired depth is reacheda 3 5 It will be understood that'the cutter 28, while desirably formed as a simple cuttingpoint, may be formed with any number of points or cutting parts that maybe deemed suitable. 9

Other changes of construction may be made without departing from the spirit of this invention, and I do not limit myself to the exact form shown. v p v What I claim; and desire to secure by Let- 9 5 ters Patent of the United States, is 1.- The combination of the spindle having a conical shoulder, a cutter-head rotatably mounted on the spindle, the collar having a conical bore engaging with said shoulder, and 10b an expanding chuck mounted on the spindle.

2. A pipe tlireading hand-lathe comprising, in combination, a central spindle provided with a screw portion, 'a cutter-head rotatable on said spindle and engaging with said screw 5 7 portion, and a collar on the spindle, said collar having a tapering portion adapted to engage with and extend into the outer end of the pipe I to center the outer portion of the spindle, and

expansible means on the spindle engaging in- I I0 I ter iorly of the pipe and holding said spindle in axial relation thereto.

3. A pipe-threading hand-lathe comprising, in combination, a central spindle provided with a screw portion, a cutter head rotatable .5

on said spindle and engaging said screw portion, a collar on the spindle having a tapering portion adapted to engage the inside of the outer end of the pipe, and an ex'pandingchuck v adapted toenter thepipe,said spindle having 1 screw --threads adapted to operate directly V j upon the chuck to expandit when-thespindle a isrotated.

4. Ina pipe-threading hand-lathe, the combination of the spindle, having a shoulder,'a 5.

cutter-head rotatably mounted on the spindle,

a detachable conical collar engaging said shoulder and adapted to engage'with the inside andend of 'said pipe, and an expanding chuck detachably mounted on said spindle 3 said also two threaded portions of different sizes and head rotatably mounted a detachable collar on'the spindle, adapted to engage between one of said shoulwith a part adapted to bear against the other two threaded portions into the pipe, andan expansivechuck detachadapted to engage the inside of the of the spindle and provided with a part adapt ed to bear against the other shoulder, the expansivemeans of said chuck ad ppef 5; The combinatlon w th the spmdle having shoulders betweensaid portions, of a cutter head rotatably mounted on the larger threaded portion of the spindle, for feeding the same, said collar gaging the threads of the smaller portion of the spindle.

7 The combination of the spindle having a conical shoulder, a cutter head rotatably mounted on the spindle, the collar having a conical bore engaging withsaid shoulder, and an expansive chuck rotatably mounted on the spindle, and having a screw engagement therewith, and means for expanding the chuck by operation of said screw engagement. In testimony whereof Ihave signed my name to this specification, in the presence of two subscribing witnesses, at Winona county of Kosciusko and State of Indiana, this 28th day of February, 1903.

' 1 JOB ders and an end of the pipe, and an expansive chuck detachably mounted on the smaller threaded portion of the spindle and provided shoulder of'the spindle, the expansive means of said chuck adapted to be operated by a portion thereof having threads engaging the threads ,of the smaller portions of the spindle. 6. The combination with the spindle having of diflerent sizes and portions, of a cutterv on the larger threaded spindle, for feeding 'thesame, of the spindle shoulders between said Witnesses:

J 01m H. BRUBAKER, WALTER BRUBAKER.

portion of he means-limiting the insertion ably mounted on the smaller threaded portion apted to heoperated by a portion thereofhaving threads en- Lake, in the 

